Lessons from Space:

The development of space-based ultraviolet astronomy began with the missions of deep-space sonders like Voyager, which allowed preliminary determination of UV spectra of remote stars. However, these methods remained largely unexploited because of constraints in the size of instruments that 1970s and '80s aerospace technology could launch.

The scientific observation of celestial radiation that has reached the vicinity of Earth, and the interpretation of these observations to determine the characteristics of the extraterrestrial bodies and phenomena that have emitted the radiation.